De-fi on Steller can positively affect XLM's market price but driving it to the moon remains uncertain,
Regarding XLM's valuation, it is difficult if it is not valued without putting market trends, lately it has been relatively stable with a lower market capitalisation compared to other too crypto currencies.

And also it will find it difficult in competing with Ethereum, Solana, and BSC due to the fact that the have more users that have more trusted users, and more market  capitalizations, XLM's valuation not certain and requires effective market analysis.
On the other hand Steller's de-fi ecosystem has to experience massive growth in terms of adoption with significant users investing in it in order for XLM to surge,