I think XLM could be a good choice for DCA while prices are low, as it has shown some potential for growth in the past. However, I would caution against making investment decisions based solely on YouTube hype and speculation about XRP's ongoing case.
If I saw, XLM's performance in the last bull run, it's important to consider that cryptocurrency prices are highly volatile and subject to many factors beyond just the performance of a single coin. Then, XLM's close ties to XRP may have contributed to its decline in the past, but this doesn't necessarily mean it will continue to be negatively impacted in the future.
In terms of whether XLM will do well if XRP wins their case, it's hard to say for sure. While some people may be bullish on XLM in this scenario, there are many other factors that could impact its price as well.
XLM is similar to XRP, but that doesn't mean it will have the same success in the long run. Everything will depend on what real use cases XLM will be able to provide to the mainstream world. The same can be said to XRP. What I like about Stellar (XLM) the most is that it's decentralized. Not like XRP which is heavily manipulated by Ripple, Inc. Fair distribution of XLM in the past through airdrop programs, have made the cryptocurrency much more equitable than XRP itself.
Demand for XLM is low, especially when all of the attention is in smart contract platforms such as ETH, BNB, ADA, and MATIC. If Stellar had smart contract capabilities (dApps), it would be in a better place on the market by now. The code is open source, anyways. So if Stellar (XLM) fails, anyone can easily build a new project using the same code to add better features, among other things. Who knows how long will the cryptocurrency last? Just my thoughts