There are lots of witnesses, if you are interested because of money, it is unlikely to be profitable for a very long time if not forever. If you are trying to strengthen the network, a seed node or full node would do a lot more.
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Thanks for the answer. What is the difference between a witness and a full node?
A witness you earn rewards based on your ranking. You monitor transactions as they are published by verifying and signing blocks.
A full node acts like a RPC node which handles requests from dapps to read and write to the blockchain.
I will look for further information about a full node. Thank you!