Justwin,
First, I would suggest tracking your play.
Keep records of what types of races that you bet: maiden specials, mcls, conditoned claimers (2life, 3life etc.) open claimers. allowances, stakes etc.
Then break down by sprint, route turf, dirt, poly etc.
After some time, a pattern may emerge where you have particular strengths and weaknesses.
For me, I seem to win higher % in MCL sprints, turf routes, dirt sprints and stakes. Not so good at claiming routes, MSW, turf sprints.
Slight edge in vertical bets versus horizontals.
Then, try to stick with your strengths.
I use the create a card for that purpose.
Bob