Which DB engines are you require to use for your data?
You have all three of these enabled: Aria, InnoDB and MyISAM. Since you have only 1GB of RAM perhaps you should consider disabling two and using just one to reduce the memory consumption. For example, you InnoDB is only using 7M of data out of available 256M, perhaps you will be better off with just MyISAM disabling both InnoDB and Aria. Or at least reduce
innodb_buffer_pool_size = 256M to something like 32M.
Then you should reduce amount of connections from 100 to just say 20-30 (you’re currently using only 6). You can increase this value gradually over time if this will not be enough.
max_connections = 30
Try to increase both
tmp_table_size = 32M and
max_heap_table_size = 32M to 64M or even 128M (you have too many tables createdd on the disk).
query_cache_size = 64M - try to reduce to 32M (Query cache efficiency is only at 47.4%)
key_buffer_size = 128M - try to reduce to 32M (you’re using only 18%). You can always increase it later if required.
Then run MySQL Tuner again in a few days to check.