Connection Error

I am using only one machine for one at a time & facing below mentioned error multiple times in a single day

original: error: remaining connection slots are reserved for non-replication superuser connections
at Parser.parseErrorMessage (C:\Users\ravi\Hezky_2.0\hezky_uat_node_2.0\node_modules\pg-protocol\dist\parser.js:287:98)
at Parser.handlePacket (C:\Users\ravi\Hezky_2.0\hezky_uat_node_2.0\node_modules\pg-protocol\dist\parser.js:126:29)
at Parser.parse (C:\Users\ravi\Hezky_2.0\hezky_uat_node_2.0\node_modules\pg-protocol\dist\parser.js:39:38)
readable:390:5)
at TLSWrap.onStreamRead (node:internal/stream_base_commons:190:23) {
length: 140,
severity: 'FATAL',
code: '53300',
detail: undefined,
hint: undefined,
position: undefined,
at TLSWrap.onStreamRead (node:internal/stream_base_commons:190:23) {
length: 140,
severity: 'FATAL',
code: '53300',
detail: undefined,
hint: undefined,
position: undefined,
internalPosition: undefined,
internalQuery: undefined,
where: undefined,
schema: undefined,
table: undefined,
column: undefined,
dataType: undefined,
constraint: undefined,
file: 'postinit.c',
line: '813',
routine: 'InitPostgres'
}
}

can someone please help to know what exactly I need to do? my plan: 1 GB RAM / 1vCPU / 10 GB Disk / Primary only / NYC3 - PostgreSQL 16