If we look at this code

we can see that .Reset simply takes a lock then allocates a fresh map by discarding the previous one.

Suggestion

We can reduce on CPU & RAM pressure by using the map clearing idiom aka

func (c *LRUTxCache) Reset() { 
 	c.mtx.Lock() 
 	defer c.mtx.Unlock() 
  
        for key := range c.cacheMap {
             delete(c.cacheMap, key)
 	}
 	c.list.Init() 
 } 

which in performance wisdom is a known and accepted Go idiom for reducing CPU & RAM pressure by reusing the map.