If I’m making mistakes [...] will betting 1/3 with range be higher EV?

How should we know that? Fact is that EV(1/3rd-range) < EV(mixed). Now, the margin between those two EVs is your error margin.If you are exceeding that margin, you will be better off implementing the range-strat (assuming you make no mistakes there - which is unlikely as well, as a strategy does not end with the cbet!!).

Also if I did play this strategy(assuming I’m going to get raised more), does this mean I should have more 3bets on the flop?

Most likely, yes. You got a weaker range that you got to defend against attacks (bluffs). You can defend by either calling or raising (3-betting). The point though is that you need way more combos IF you call than if you raise, reason being that Villain can realize EQ with his bluffs if you just call. That means that most likely the amount of combos to be called vs. 3-bets is so high that you had to start calling with crap, which means, 3betting becomes more important.

I would suggest setting up a filter in HM or PT and analyze your c bet success based off of sizing ranges (make sure you isolate single raised pots). In your case, I would filter for 0 to 34.99% pot sizing and jot down my c bet success, I would then filter for 35% to around 69.99% and jot down my c bet success and then I would do 70%+ and see how successful my c bets are. I would also take it one further and try to establish how often I win the hands based on the various sizing ranges.

Remember, when you bet 1/3 pot, you need to win on that node 25% of the time to print. When you bet full pot, you need to win on that node 50% of the time to print. In general, you are typically going to fall somewhere in between that range most of the time as far as sizing goes.

this is all about the standards you set for yourself

you know your not good enough to do X but you also know X is the correct thing to do

the way to resolve this is to slowly ease into these spots and try to learn and improve until you are confident to know you are good enough to do x and now you are doing the correct thing - and in this process you will learn a new thing you are not good enough to do but feel its correct, repeating this process improves you over time

if you settle for a 1/3 range bet in all spots then you wont actually resolve this issue because in your mind you already know it is suboptimal, this process over time causes dissonance

the guy who has standardize his 1/3 range cbet without knowing it is suboptimal has maxed his ev over time even though it is not the highest ev

but for you since you already have prior knowledge of something better, your ev wont match the one of the previous mentioned oblivious 1/3 range cbetting auto pilot reg

i suggest the italics paragraph and deviate/experiment to improve your standards in area in which you know you are suboptimal and do not settle for someone less because it is comfortable - just like in life you know?

I think others covered this well but had a couple thoughts to share.

First having a strategy of say bet 3/4 some flops, bet 1/3 some flops and then check some isn’t that complicated. I’m my experience it’s more making yourself remember to stop and think at a spot then not understanding what to do. I’ve been away from Poker for several years and just getting back. I find the issue at least for me, isn’t being able to play a split strategy as much as it is making your stop and think “ what is my bet sizing here” before you just autopilot bet 1/3 or 3/4 or whatever.

I’ve found a few things helpful here

1) Pick 1 or at most 2 areas you are going to focus on to improve your strategy. If you are going to try to implement a bunch of things at once your brain will likely autopilot more since it can really only keep a small number of things “top of mind”

2) Say something out loud to trigger the situation. I chose the exact scenario a while back and would literally say “I have the opportunity to CBet” out loud when I saw the flop as the pfr (my wife often looks at me funny). Saying something out loud is a trigger that helps rewrite the brains connection to retrain how to handle the situation and avoid autopilot

3) Set up filters in your review after the session to review how you did in the scenario. Again using your example it might just be a “could cbet “ filter and then review each hand to see how you did. I make myself write down or type to a file each time I made a “mistake”. Again this is to help make the brain make connections. I rarely go back and look at this but the act of writing it down helps the brain connect.

Tbh your better off putting some time and effort into learning more about cbetting strategy and improving on where you think you are making mistakes than just range betting every flop.

Decent 100nl regs are going to start exploiting you by check raising/ raising more flops when they see your cbet stat.

If you want to start 3betting more flops then you have to learn that particular strategy very well or the mistakes will cost you.