Do you not think that BG 7.24 and 7.25 contradict each other,God has a form which is supreme..the lord is not formless..God is the Energetic and his effulgence(impersonal aspect - brahman) is His energy that pervades everything..Having His original form n taking innumerable forms does not make Him many but still he remains one but deals with His devotees in different moods...All the forms of God mentioned in as Rama/Krishna/Varaha/Nrsimha are all eternal n eternally existing before & will ever exist since they are all eternal...don't 4get that Vaikuntha is unlimitedly expansive without any end and there are innumerable vaikuntha planets there where the Lord associate with his devotees in different moods but still remains one..all the presiding deities of the innumerable vaikuntha planets are Chatur bhuja form even Varaha, Nrsimha..devotees attracted to some particular leela of the Lord dedicate themselves to the mood associated to those leela n goes to serve the Lord to the vaikuntha planet where the Lord displays those passtimes for the pleasure of His Devotees..His form is sat chit Ananda vigraha..
Some of BG verses which declares God as very personal
Translation of Bhagavad Gita 7.24
avyaktaḿ vyaktim āpannaḿ
manyante mām abuddhayaḥ
paraḿ bhāvam ajānanto
mamāvyayam anuttamam
Unintelligent men, who do not know Me perfectly, think that I, the Supreme Personality of Godhead, Krishna, was impersonal before and have now assumed this personality. Due to their small knowledge, they do not know My higher nature, which is imperishable and supreme.
Translation of Bhagavad Gita 7.25
nāhaḿ prakāśaḥ sarvasya
yoga-māyā-samāvṛtaḥ
mūḍho ’yaḿ nābhijānāti
loko mām ajam avyayam
I am never manifest to the foolish and unintelligent. For them I am covered by My internal potency, and therefore they do not know that I am unborn and infallible.
Translation of Bhagavad Gita 7.26
vedāhaḿ samatītāni
vartamānāni cārjuna
bhaviṣyāṇi ca bhūtāni
māḿ tu veda na kaścana
O Arjuna, as the Supreme Personality of Godhead, I know everything that has happened in the past, all that is happening in the present, and all things that are yet to come. I also know all living entities; but Me no one knows
Translation of Bhagavad Gita 9.11
avajānanti māḿ mūḍhā
mānuṣīḿ tanum āśritam
paraḿ bhāvam ajānanto
mama bhūta-maheśvaram
Fools deride Me when I descend in the human form. They do not know My transcendental nature as the Supreme Lord of all that be.
..Chapter twelve of BG explains the personal/impersonal aspect & the best way of worship.
7.25 says he is unborn , but 7.24 says he is the Supreme Krishna , and we know that Krishna was born and had a childhood , adulthood , mother , father etc. How do you reconcile.