Hello ;)
I can (without thinking too much about it) find 3 options here (im sure others will find more or better options...)
1) Learn, adapt, and then continue on your journey in order to find another Elder summoning location (this is the option i recommend despite Valheim can be quite "harsh" to the players - at least sometimes). Note that a 3rd Elder summoning location can be even further away from your base and maybe it is also not that accessible like the two Elder summoning points you found so far.
2) Google "Valheim Map Generator" and enter your Seed code/number in order to generate your whole (!) world so you can see where (and if) there any other Elder summoning points.
3) Start a new game - optionally, if you choose this option, you can transfer your equipment and your "loot" to the new world by putting it into your character's inventory and then log into your new world. You can relog as many times as needed to transfer your whole equipment. (Characters and worlds are "independent" from each other in the way that they are two saves: one for the character and one for the world. This allows you to play several worlds with one character. Disclaimer: Personally, I do not support this playstyle - for me it is "One World, One Character). But if you play solo there wont be any judges and no limitatations on your playstyle.

Hope this helps a little bit

MFG
CKTMC

PS: Humans invented "paragraphs" to make longer texts more legible ;)