Bring in outside money by getting people to invest in the platform and encouraging them to buy Hive to power up. This would be like getting people to invest or buy stock in your platform. Which would make the value of the stock go up for current holders.
The other would be to sell ads or solicit donations and use this money to do a "stock buyback" except with coins. Your platform has to essential earn money. This would be like having customers that pay you for your product and using that money to reduce the supply of tokens or pay a dividend in direct cash to token holders.
Then as you mention there is "burning". There is forced burning or burning via a vote. Every voting cycle you can have the delegates, witnesses, node owners, or whoever vote to burn currency or distribute. Burning will increase the per unit value of the currency by reducing supply and voting to distribute will increase the supply and reduce the per token value.
The other is algorithm proportional expansion and contraction which some people in the crypto world called "rebasing". The proportion that you have of the total money supply stays constant. So if you have 10% of the total supply you will still have 10% after the rebase, but the nominal number of coins you have in your wallet fluctuates daily. Amplforth (AMPL) does this.
Another way is to back your currency with gold or dollars or whatever currency god you pray to. Your supply of crypto will expand and contract along with whatever who you are holding in reserve as the backing currency.
Creating products that "consume" tokens. This can be done in a lot of ways such as creating a product that consumes tokens like toys or NFTs that can be used to "pull" tokens out of circulation and then burning the tokens once they are out of circulation. You can also offer services that pull tokens.
I am sure there are other ways that I am not aware of, but anything that reduces the total supply of tokens or anything that makes people want (demand) more tokens will improve the token value.
Leo uses ad revenue to buy back tokens and that's something that I figured hive devs would explore. All pretty interesting ideas though. A proper combination of them would lead to increase in token value but for now, there seems to be more intetest in development of the project than in the token value.
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Which is okay by me. Like we mentioned earlier. You can have good engagement and not have good token value. Bitcoin doesn't do anything and its super rich lol.