Take your losses on your 2020 US tax..return, in my non-professional opinion. 2020 was the year TMPS got de-registered, delisted, ceased operations, etc. This is provable. You may not be able to take the loss this year (or in any year after 2020).
You did not have to sell the stock in 2020 to take the loss, I believe.
If somehow the corporation revives and the shares can be sold at some price, your tax on profit would be calculated from a basis of zero if you had written them off.
All of this is just opinion, but I have done this for my own shares.
Always be on guard for misleading, deceptive or erroneous messages. I am not an investment professional. My messages are my opinion only, and are subject to change when contrary information is later relied upon. Always do your own research.