How I vote depends on what the most likely outcome of that vote is on issues I care about.
Before about 2015 I was a lifelong Lib Dem voter. I would vote for them in first past the post elections (sometimes in a seat they may win, sometimes not) and in the London assembly (sort of proportional representation) because I felt they chimed with my values and whether or not they won I wanted to send a signal that they were my party of choice.
Then came the ridiculous 'a woman is whoever feels like a woman'.
I changed to being a single issue voter - I would not vote for anyone who didn't know that a woman was an adult human female, and defend single sex spaces. If first past the post limited my choice of outcome, I would spoil my ballot or vote for the party I felt (for whatever reason) would uphold women's rights between the two candidates who were likely to win the seat.
When the happy day comes that many parties can define a woman as an adult human female, then in propertional representation elections I will choose whichever party of those is the most 'green'.
In first past the post I will look at the likely outcome and may vote 'for' someone, may vote 'to keep someone out' or may vote for who I choose regardless of the fact they will never win, depending on the situation at the time.
Depending on time, party policy, view of candidate and location, some of the time I therefore may vote Tory.