Yes, if you invest in SEER, you can just buy and HODL the token for a long time. I also believe SEER has good potential in the future because even now the SEER project is actively sponsoring fighting tournaments in China with NayunSport, and other partners.
While the second option you can join is the system witness where this system you can have passive income if you have enough collateral and of course this witness system has a limit of up to 101 people. For more information, you can read the SEER whitepaper here: https://www.seer.best/download/SEER_en.pdf

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As you know from the very beginning the blockchain system was designed like this. And until now no project has implemented a cancellation system. But you don't need to worry about the system on SEER because we use easily distinguishable addresses, that's because the wallet address used in SEER transactions uses your account username. So it can be considered very unique and can reduce errors in sending transactions to wrong addresses.