What is current rate and how much reduce rate ?

In most TA, there is a clause to state that  .
"Upon renewal of TA, the landlord can review the monthly rental at max 10% from the last rental"

So you can start with -RM100 to the max -RM250.

You can deal directly with him since he is oredi your tenant.

Agent"s role is to pass message and helps to prepare TA renewal which is borned by the tenant.

Is for you to decide whether the agent's services deserve the fee ?

The quantum need not necessary be a month's rental but a reasonable amount for work done if you so decide to let him handle.

1.

Sign a new TA. If both party agreed to the terms of the 1st TA, then follow. To save on fee, can DIY. Just pay for stamping only.

Retype the agreement and change the relevant dates and monthly rental rate and deposits where applicable. Print 2 sets and sign. To have a Witness for both signatures.

Go to LHDN for stamping within 30 days from date of agreement.

2.

Request tenant to write officially agreeing to continue the tenancy and following the same terms of the 1st TA OR with amended terms where applicable and changing the relevant dates or rental rate. You acknowledge and keep a copy.

No fees applicable.

3.

Verbal confirmation for extension. (NOT RECOMMENDED)
CAUTION ......

No agreement is 100% without dispute whether in writing or verbal during the duration of tenancy.