Voting Tory in 2019 does not make you a Tory voter, they had a majority then! Just like voting Labour in 2024 does not make you a Labour voter, with a majority too.
If you voted Labour in 2019 and for Corbyn, then you are definitely a proper Labour voter.
I have voted Lib Dem in the last few elections, but voted Labour under Blair and then for his successors too, even post financial crisis. However, I would never have voted for Corbyn. Nor would I ever vote Tory unless this current lot start similar levels of infighting as the Tories did. Then I would vote and hold my nose to keep them out. Because I know Lib Dem won’t win, even though they are my party now.
Far more people vote tactically than is acknowledged. Many people are swing voters. People are far more loyal to their football teams that political parties, that is pretty much a fact these days.