I don’t have a target because the physical constraints of your system set the target.
There are ways to increase your return -
increase your account capital - but how come you had money lying around not working for you?
take more trades - but surely you already take all the trades that your capital allows which fit your set-ups?
increase your position sizes - maybe, but only if your strategy is cast-iron consistent
select better trades - but aren’t you already taking the best trades and leaving the worst?
cut your losers earlier - sounds good
run your winners longer - sounds good
don’t make mistakes - surely you already follow this rule?
But if you can improve the above then your strategy wasn’t really ready yet. Once its matured and developed as far as you can go with it, then it hands down your % return and you can only increase that by changing strategies / trading styles altogether.